Removed all usage of NSDate from KWTimeout and KWProbePoller, replaced with CF counterparts
Added test to illustrate issues with stubbing NSDate date to return a mocked date
Removing commented line of code
Merge pull request #405 from pfransen/allow_nsdate_stub

Fix for NSDate mock/stubs & shouldEventually
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Added a flag to prevent KWCaptureSpy from raising an error when the argument is nil.

This makes it possible to use [[expectFutureValue(spy.argument) should] beNonNil] in asynchronous captures.
Re-introduced property on KWCaptureSpy to poll whether the argument is captured already.
Removed dependency on argument being nil for checking whether an argument was captured.
Added public property for checking the capture.
Merge remote-tracking branch 'origin/master'